Getting started isn't terribly confusing. If you're new to Java and frameworks in general, pay close attention. If you're not, this will be a cake walk.
Even though you can write Java and Pronghorn apps in any editor of your choice, we recommend the following IDEs:
Minimum requirement for the JDK is Java 7. Get it here. Pronghorn has module compatibility up to Java 9.
If you have developed applications using Java before, Maven will be familiar. Pronghorn uses Maven as well as Maven central for releases and snapshots. Dependencies inside Pronghorn and its related projects are all managed using Maven.
To install Maven on your machine, please follow this guide on the Maven page.